Smoking Cessation in Patients With Cancer

This randomized controlled trial will evaluate whether adding one-session structured cognitive behavioral therapy (CBT)-based smoking-cessation counseling to standardized brief smoking-cessation counseling improves cigarette smoking abstinence among patients with cancer who smoked combustible cigarettes at diagnosis and are still smoking at screening and enrollment. After written informed consent and baseline assessment, all participants will receive the same standardized brief smoking-cessation counseling using a condensed 5A framework. Participants will then be randomly assigned 1:1 to no additional study CBT or to one additional structured CBT-based smoking-cessation session. Follow-up will continue for 3 months after randomization at Campus 3 of Vietnam National Cancer Hospital in Hanoi, Vietnam.